Medial Tibial Stress Syndrome, which causes pain and tenderness along the inner side of the lower leg that improves on activity and gets worse after resting.
Tibial Stress Fracture occurs when medial tibial stress syndrome is left untreated and can prevent you from fully bearing weight on your legs. It is usually characterised by local swelling, specific pain, and tenderness on the leg bone.
Popliteal Arterial Entrapment Syndrome is when the main artery behind the knee becomes compressed by surrounding muscles or tendons behind the knee. Which can lead to the lower leg can cause symptoms like calf pain, cramping, and difficulty walking during exercise.
Biomechanical Overload Syndrome is a common issue in runners and can often predispose to more significant injury. Calf pain/tightness after runs is a common sign..